321–340 of 373 results

Stellar Science

In Memoriam, Star-style

Twenty-five years ago, a star exploded in the Large Magellanic Cloud. The first easily seen supernova since before astronomers turned telescopes to study the heavens, the explosion heralded a new age of astronomy.

Celestial News & Events

Venus on the Rise

Noticed an exceptionally bright beacon in the evening sky? The planet Venus has begun its highest foray up the sky's dome, surprising at least one casual observer as it prepares for its conjunction with the Moon and Jupiter in March.

Stellar Science

No Winds of Change for Eta Carinae

Faint echoes from the massive, hot star’s Great Eruption suggest that a standard explanation for that event may not match what really happen. Not conclusive, the new study is sure to kick off debate among stellar astronomers.


The Dwarfs are for the Dwarfs

Two teams of astronomers have independently announced the detection of a dwarf galaxy being eaten by another dwarf galaxy, NGC 4449. Seen in this image as a faint swipe of red stars, the satellite will probably be shredded after only a few orbits of its host, adding its stars to that galaxy's collection.

Astronomy & Observing News

The Spin's the Thing

Astrophysicists’ new work suggests that a black hole spits out a more powerful jet if it’s spinning the same direction as the hot material falling into it. The conclusion adds to an ongoing debate about how (or whether) the direction of a black hole's spin affects the outflow it spews into space.


Galaxy in a Bucket

A tiny lab experiment could provide additional evidence for how galaxies come by their magnetic fields. The physics isn't new, but that's part of the allure.

Astronomy & Observing News

Ancient Astronomers Were No Fools

A study of historical star catalogs has turned up a surprising result: long-gone stargazers knew that the stellar magnitudes they observed needed correcting — but the correction is for an atmospheric effect scientists didn’t quantify until the 1700s.

Astronomy & Observing News

An Evaporating Exoplanet?

Brief, variable dips in the light from a low-mass star have left astronomers wondering what strange object could be periodically blocking the starlight. Their hypothesis? A closely-orbiting planet is disintegrating before their eyes.

Astronomy & Observing News

Sky & Telescope April 2012

Sky & Telescope's April 2012 issue is now available to digital subscribers.

Astronomy & Observing News

Sky & Telescope March 2012

Sky & Telescope's March 2012 issue is now available to digital subscribers.


Alien Mars Announced

Aided by an amateur astronomer, Kepler scientists have detected an exoplanet system containing three sub-Earth-sized planets, the smallest of which is about the size of Mars.

Stellar Science

Black Hole Shoots Bullets

Observations of a black hole that spat out twin blobs of superhot material may help astronomers understand how the mysterious beasts create powerful jets that shoot out from their poles. The blobs appeared just as the system went quiet in X-rays.


New Maps of Dark Matter

An intensive study of dark matter’s distribution in the universe has verified predictions of where the invisible stuff that makes up the majority of cosmic matter resides.

Celestial News & Events

New Supernova in Leo

Along with the usual galaxies, dark matter, and exoplanets, the American Astronomical Society's January meeting is abuzz with the discovery of a supernova by a team of amateurs. Astronomers are rushing to observe the explosion before it fades.

Solar System

Pseudo-moons Orbit Earth

Temporary satellites are frequently caught from Earth's neighborhood and may make regular passes at being moonlets. But the objects only stick around long enough to orbit a few times before the Moon kicks them back out into the cold.

Stellar Science

Young Stars Aren’t So Young

Astronomers age-dating the nearest large association of young stars have found that one subgroup may be twice as old as previously thought.

Astronomy & Observing News

Sky & Telescope February 2012

Sky & Telescope's February 2012 issue is now available to digital subscribers.

Black Holes

Black Hole Breakfast En Route

Astronomers have discovered a dusty, stretched-out cloud heading for the supermassive black hole lurking in the Milky Way's core. The blob could be the meal the beast needs to wake up for a bit from its slumber, if the cloud survives its incoming trip on the dining cart.

Solar System

Asteroids, Planets, and Moons, Oh My

This week’s meeting of the American Geophysical Union brought together a variety of interesting science results, from water on Mars to the Sun’s effect on the Moon’s surface. Here’s a selection of curiosities for your perusing pleasure.


Super Black Holes: New Records, If Real

This week astronomers announced the existence of two gargantuan black holes. The black holes may be the most massive ever directly measured — if further studies can validate them.